Date: Tue, 11 Dec 2001 22:16:19 -0700 From: Warner Losh <imp@harmony.village.org> To: Terry Lambert <tlambert2@mindspring.com> Cc: Danny Braniss <danny@cs.huji.ac.il>, Bernd Walter <ticso@cicely8.cicely.de>, Mike Smith <msmith@FreeBSD.ORG>, freebsd-hackers@FreeBSD.ORG Subject: Re: irq Message-ID: <200112120516.fBC5GJM33101@harmony.village.org> In-Reply-To: Your message of "Tue, 11 Dec 2001 06:14:45 PST." <3C1614D5.B5C3B4C5@mindspring.com> References: <3C1614D5.B5C3B4C5@mindspring.com> <E16Dk3D-000AIb-00@pampa.cs.huji.ac.il>
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In message <3C1614D5.B5C3B4C5@mindspring.com> Terry Lambert writes: : Some cards do not have a hardware "I caused an interrupt" register, : and use a differential (e.g. ring head vs. tail inequal after : interrupt) to tell if there is work to do. If these cards were to : share interrupts, then they most likely do work every interrupt, : and less work per interrupt, then would otherwise be the case (i.e. : it would defeat hardware interrupt coelescing thresholds, among : other things). No such PCI cards can exists. The PCI spec requires that interrupt sharing work. Warner To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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